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I don't think this is a xen optimization exactly but here is an example xen config provided by Alowishus for running a Windows domain under Xen with HVM:
kernel = "/usr/lib/xen-ioemu-3.1/boot/hvmloader" builder="hvm" memory = 512 name = "w2k3-001" disk = [ 'phy:/dev/Guests/w2k3-001,hda,w', 'file:/images/Windows-2003-Server-R2-VLA-Disk-1.ISO,hdc:c drom,r' ] device_model = "/usr/lib/xen-ioemu-3.1/bin/qemu-dm" boot="c" vnc=1 usbdevice='tablet' vif = [ 'type=ioemu, bridge=xenbr1' ]